Automatic draft-regulating damper



(NoModeL) A 2 Sheets-Sheet 1.

C. .D. HOWARD. AUTOMATIC DRAFT REGULATING DAMPER.

Patented 0st. 6, 1891.

ll, -a' a 2 Sheets-Sheet 2. U. D. HOWARD. AUTOMATIC DRAFT REGULATING DAMPER. No. 460,579.

(No Model.)

Patented Oct. 6, 1891.

INVENTOR. Wm MW im A TTORNEYS WI TNESSES:

UNITED STATES ATENT FFKJE;

CHARLES D. I-IO\VARD, OF SYRACUSE, NEW YORK.

AUTOMATIC DRAFT-REGULATING DAMPER.

SPECIFICATION forming part of Letters Patent No. 460,579, dated October 6, 1891.

Application filed January 30, 1891. $eria1 No. 379,613. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES D. HOWARD, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Automatic Draft- Regulating Dampers, of which the following, taken inv connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to thermostatic devices for regulating the drafts or dampers of heating apparatus dependent for their action upon the temperature of the room in which the thermostat is located.

My object is to produce a thermostatic draft or damper regulator controlled by the temperature of the room being heated and in which the thermostat is located, and which can be adjusted so that I can readily vary the temperature to which the room is to be heated by varying the extent to which the drafts will be opened, thus changing the character of the fire from a quick and lively one, as in cold weather, to a slow one in warmer weather, giving the fire more or less direct draft or check-draft, as may be desired, all this being done either with or without an indicator. When used, the indicator is automatically set by the adjustment hereinafter specifically described, and herein lies the principal novelty of my invention.

My invention consists in the several novel features of construction and operation hereinafter described, and which are specifically set forth in the claim hereunto annexed. It is constructed as follows, reference being had to the accompanying drawings, in which- Figure 1 is an elevation of the draft-regulator complete and connected to the directdraft and check-draft dampers of a furnace. Fig. 2 is an enlarged front elevation of part of the thermostatic bar, the indicator, and their connections, and the scale. Fig. 3 is a longitudinal section of the same.

A is an ordinary thermostatic bar, constructed of materials possessing different expansible properties-as, for instance, hard rubber and brass-shown in the drawings as suspended from and rigidly secured upon a bolt or pin E upon the wall of the room to be heated.

B and O are respectively the direct and check draft pipes, the one opening into the ash-pit and the other into the smoke-pipe. Pistons 1 and 2 are suspended in the upper ends of these pipes from a centrally-balanced lever 3, mounted beneath the floor above the furnace. A rod 4, connected to this lever near one end, extends up through the floor, having in Fig. 1 a pivotal connection to the bell-crank 5. This bell-crank is pivoted at 6, and its upper arm is connected by the connecting-rod 7, connected to the lower end of the thermostat by an ordinary pivot-joint.

In the figures I show the thermostatic bar pivoted near the top upon the pin E and connected by the pin a, through the slot 1) in the bar, into the lower end of'the indicatorhand, which latter is pivoted upon the thumbscrew 0, loosely inserted through it into the wall and by which the indicator-hand can be set at any point upon the scale 9. IVhen so set and secured, this thumb-screw c and the lower pin E together operate to hold the top of the thermostat securely and prevent it from swinging upon the lower pin. It is operated as follows: Then the temperature stands at the normal pointsay both of the pistons will stand in the pipes, substantially as shown in Fig. 1. \Vheu the tempera ture lowers below that point, the deflect-ion of the thermostat to the left will, through the connections, raise the piston 1 and open the direct draft through the opening to, created by scarfing off one side of the pipe, and when the temperature rises above 70 the deflection of the bar to the right will force the piston 1 down; closing the direct draft and raising the piston 2, that pipe being also scarfed 01f, creating the opening I). In Fig. 2 I accomplish the same result by loosening the thumb-screw, then moving the indicator point upon this screw as a pivot over to the right, which swings the upper end of the thermostat to the right and gives more check and less direct draft, and when so shifted according to the scale to the variation desired I tighten this thumb-screw and secure the thermostat in its new relation to the other parts. In like manner I obtain more draft and less check by moving the indicator to the left.

WVhat I claim as my invention, and desire to secure by Letters Patent, is-

In an automatic draftregulator, a thermostatic bar having different expansible properties pivotally suspended in the room desired to be heated, in combination With intemnedi- In witness whereof I have hereunto set my ate connections between it and the draft-reguhand this 20th day of J anuary, 1891. lating pistons, the draft-regulating pistons,

and an indicator-hand loosely connected to CHAS. D. ITOXVAR'D. the thermostatic bar and pivoted upon and In presence of secured in the position at which it is set by H. P. DENISON,

the thnmb'soreW through it. O. V. SMITH. 

